I am working with FB for 2 month now and I really like it because it's a very powerful tool to create complex build processes.
But I don't use the FB server because it doesn't support triggers for repository changes. That's why I use CruiseControl as the continuous integration service. Can't you guys do that as well?
You'll be pleased to know that the next version of FinalBuilder Server does indeed have triggers for repository changes and the beta is due to be released very soon.